My friends uncle owned a restaurant in Ohio and as the story goes, people would go there just for these sandwiches. So I'm the lucky one that got the recipe! And a bonus is its so easy.
Ingredients
Family pack of boneless skinless chicken breasts
Family pack of boneless skinless chicken thighs
3-4 packets dry onion soup mix
Salt and pepper
Put all the chicken in a large crock pot. Add water until chicken is just covered. Add soup mix. Stir to dissolve soup. Cook on low all day. Stir to shed chicken. Use slotted spoon to slightly drain chicken before putting it on a roll. Add a slice of cheese if you wish. Makes a ton. Delish!

